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18-4(5-r)=-22
We move all terms to the left:
18-4(5-r)-(-22)=0
We add all the numbers together, and all the variables
-4(-1r+5)+18-(-22)=0
We add all the numbers together, and all the variables
-4(-1r+5)+40=0
We multiply parentheses
4r-20+40=0
We add all the numbers together, and all the variables
4r+20=0
We move all terms containing r to the left, all other terms to the right
4r=-20
r=-20/4
r=-5
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